* {
  margin: 0;
  padding: 0;
  color: #fff;
}
li {
  list-style: none;
  float: left;
  width: 90px;
  height: 100%;
  font-size: 14px;
  line-height: 56px;
  text-align: center;
  border-right: 1px solid #000;
}
ul li:nth-child(6) {
  border: none;
}
.nav {
  width: 1100px;
  height: 96px;
  background: linear-gradient(to right, white, gray);
  margin: 0 auto;
  overflow: hidden;
}
.nav > div {
  width: 980px;
  height: 56px;
  margin: 20px auto;
  background-color: rgb(29, 29, 29);
}
.sider_bar {
  float: right;
  width: 200px;
  height: 26px;
  margin-top: 15px;
  margin-right: 18px;
  background-color: #000;
}
input {
  outline: none;
  background-color: #000;
  border: none;
}
input::placeholder {
  color: #fff;
}
li:hover,
li.hover {
  background: linear-gradient(to bottom, rgb(111, 3, 3), rgb(161, 9, 7));
}
